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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A008837 a(n) = p*(p-1)/2 for p = prime(n).

Table of values

n a(n)
1 1
2 3
3 10
4 21
5 55
6 78
7 136
8 171
9 253
10 406
11 465
12 666
13 820
14 903
15 1081
16 1378
17 1711
18 1830
19 2211
20 2485
21 2628
22 3081
23 3403
24 3916
25 4656
26 5050
27 5253
28 5671
29 5886
30 6328
31 8001
32 8515
33 9316
34 9591
35 11026
36 11325
37 12246
38 13203
39 13861
40 14878
41 15931
42 16290
43 18145
44 18528
45 19306

List of values

[1, 3, 10, 21, 55, 78, 136, 171, 253, 406, 465, 666, 820, 903, 1081, 1378, 1711, 1830, 2211, 2485, 2628, 3081, 3403, 3916, 4656, 5050, 5253, 5671, 5886, 6328, 8001, 8515, 9316, 9591, 11026, 11325, 12246, 13203, 13861, 14878, 15931, 16290, 18145, 18528, 19306]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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